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This article in AJ

  1. Vol. 60 No. 6, p. 610-612
    Received: Mar 5, 1968

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In Vitro and In Vivo Digestibility and Ad Libitum Intake of Mechanical Mixtures of Forages1

  1. W. G. Monson and
  2. J. T. Reid2



We determined in vitro digestible dry matter for two legumes (alfalfa and birdsfoot trefoil) and four grasses (smooth bromegrass, timothy, Reed canarygrass, and orchardgrass). Early- and late-cut forage from each species was analyzed by a modified Tilley and Terry two-stage digestion procedure. One-third/two-thirds mixtures were studied in all combinations within species and between each grass and legume. Certain mixtures of grasses and birdsfoot trefoil gave small, but consistent increases in dry-matter digestibility over that calculated from the weighted mean of the mixture components. Dry-matter digestibility and ad libitum intake of timothy and birdsfoot trefoil, separately and in mixtures, were determined in a feeding trial with sheep and steers. All forages in the in vivo studies had similar digestibilities. Average intake values of 117, 124, and 136% (timothy alone = 100) were obtained when forage fed was 33, 67, or 100% birdsfoot trefoil.

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